Solve all practical applications related to the selection of salary control valves, as well as all repairs and adjustments for imported positioners
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As stated in the title, it covers the selection of valves for the constant-value portion, with optimization of such selections based on actual process conditions. It also addresses the maintenance, self-checking, and debugging of all types of input positioners, such as those from Siemens, ABB, Azbil, Fisher, as well as the debugging and maintenance of electric actuators
I. The selection of process valves generally takes the following factors into consideration: 1. Working medium: The appropriate valve material and structure are chosen based on the medium’s corrosivity, viscosity, presence of solid particles, as well as whether it is explosive or toxic. 2. Operating pressure and temperature: The material and strength of the valve are determined based on the operating pressure and temperature of the medium. 3. Flow control requirements: Select the appropriate valve type and actuation method based on the level of precision and the range of adjustment required for flow control. 4. Installation and maintenance: Consider the installation location and space for the valve, as well as selecting an appropriate valve based on its maintenance requirements. II. Self-check and debugging of imported positioners – Taking Siemens as an example: 1. Self-check: First, perform a self-check on the positioner to confirm that it is functioning properly. Self-check mainly includes the inspection of power supply voltage, input/output modules, etc. 2. Debugging: Generally, the debugging of a positioner involves adjusting the gain, setting the zero point and range of valve position feedback, and configuring control parameters. During debugging, specialized debugging equipment and software are required. III. The debugging and maintenance of electric actuators mainly involve the following steps: 1. First, check whether there is any damage to the appearance and mechanical parts of the electric actuator, such as screws, connecting rods, seals, etc. 2. Then check the electrical components of the electric actuator, such as the motor, limit switches, controller, etc., to ensure they are functioning properly. 3. Based on the inspection results, repair or replace the faulty parts. 4. Finally, debug the electric actuator to confirm that it is working properly. The above are merely general maintenance and debugging steps; the actual process may vary depending on factors such as the device model and the extent of damage. Such operations should be carried out by professional technicians. .